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Operations of 4 Ram Steering gear
1)Steering gear pump is uni directional. During idle mode, there are no pumping stroke.
2)When torque motor sense signal from bridge, the directional control valve will operate to the direction by bridge and pump will be put to stroke.
3)After 10-20sec of starting, the unloading device will activate and pilot oil pressure will operate the unloading valve.
4)Pressurize oil from main pump go through rams thought isolating valve and turn the rudder
5)When desired angle is achieved, the potential meter give signal to bridge and bridge gives signal to torque meter to neutral position. Pump return to 0 stroke and run idle.4 Ram steering gear explaination Its a different diagram but similar concept.
Unloader
From the above Unloader, the left box is when the steering is in operation and the right is for unloading.
The left box consist of 2 check valves, when in operation, the left check valve opens and prevents the return of the oil, and the right check valve for the returned oil is opened by the left line, thus allowing the oil return.
Relief valves
Relief valve reliefs the excess hydraulic pressure that might be created from waves acting on the rudder.
Isolating valves
In the case of leakage area as shown above, Low low level alarm will be activated when the level of hydraulic oil decreases in the tank. When the alarm is activated, Both isolating valve will be activated & No.1 Lo pump will be switched over to No.2 pump.
4 Rams system work in a Pair. Thus when #4 Ram pipe is leaking, #3 & #4 ram is then isolated.
Through Lo #2 pump and only using #1 & #2 Ram, the system is still operable as shown above.
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